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#3 is as a result of directory listing being left enabled on the web server. The apache signature is also left on so we know exactly what OS is running and the version of apache running. Serious security threat but I dont think that has any effect on the load time of the site.

They are good for inspiration. You can combine inspirations from one or more templates to form something unique :)

I tried out Collabtive and its got some of your requirements. You can check it out here http://collabtive.o-dyn.de/